MP1521EK データシートの表示（PDF） - Monolithic Power Systems

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MP1521EK

High Efficiency White LED Driver

Monolithic Power Systems 

Monolithic Power Systems

Pin Description

MSOP10

MP1521

High Efficiency

White LED Driver

QFN16

IN

1

EN

2

REF

3

BRT

4

FB3

5

10

SW

9

GND

8

OLS

7

FB1

6

FB2

NC 1

EN 2

NC 3

REF 4

12 GND

Top 11 GND

View 10 OLS

9 FB1

Part Marking: MP1521EK

Part Marking: A1xx

Table 1: MP1521 MSOP10 and QFN16 Pin Assignments

MSOP

Pin #

1

2

3

4

5

6

7

8

9

10

-

QFN

Pin#

16

2

4

5

7

8

9

10

11, 12

14

1, 3, 6,

13, 15

Pin

Name

IN

EN

REF

BRT

FB3

FB2

FB1

OLS

GND

SW

N/C

Pin Function

Input supply pin. It can be connected to the regulator’s input supply, or to the

output for boot-strapped operation (boot-strapped operation is required for VIN of

less than 3V).

Regulator On/Off control input. Logic high (VEN>1V) turns on IC, logic low puts it

into low current shutdown mode. Place a 100KΩ resistor in series with EN if it is

connected to a voltage greater than 10V.

1.23V reference used for setting the analog control voltage at BRT input. This

reference can supply up to 200µA to an external load. Do not connect any

bypass capacitors to this pin. It is internally compensated.

Analog or PWM input for controlling LED brightness. When used in analog

mode, apply a DC voltage of 0.3 to 1.2V. This input voltage is attenuated by 1/3

to set the voltage across sense resistors at FB1, FB2, and FB3. Maximum

brightness (20mA) occurs with 1.2V applied. To control brightness in PWM

mode, apply a PWM square wave with a minimum voltage less the 0.18V and a

maximum greater than 1.2V. When a voltage less than 0.18V is applied to this

pin, the output switch is turned off. The regulator operates at maximum

brightness when more than 1.2V is applied. The frequency of the PWM signal

must be between 100 to 400 Hz.

Feedback input for measuring voltage across current-sense resistor that is in

series with LED string. Unused feedback pins must be connected to any used

feedback pin.

Open Load Shutdown pin senses regulator output voltage to protect IC during

open load operation. When this pin’s voltage exceeds 28V, the output switch is

shut off. The output switch remains off until the IC is reset by cycling the enable

pin (EN) or input supply (IN) pin.

Signal and power ground. Connect directly to ground plane.

Output switch pin, power DMOS low-side switch.

No Connect

MP1521 Rev 2.7 10/06/04

www.monolithicpower.com

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